-
公开(公告)号：US4734691A
公开(公告)日：1988-03-29
申请号：US826692
申请日：1986-02-06
CPC分类号： G09G1/002
摘要： In order to compensate for image distortion introduced into a digitally controlled raster-scan CRT by the finite video amplifier rise and fall times, the digital video drive waveform is subjected to selective pulse stretching to extend the duration of each pel which is immediately preceded by a pel of lower light intensity value (brightness). This is achieved by means of a comparator (14) which examines each current pel PEL(N) in the video data stream in relation to its immediately preceding neighbor PEL(N-1) in order to detect pel boundary transition therebetween representing an increase in brightness from the preceding pel to the current pel. Re-timing means (17, 19, 21, 22) is operably under control of the comparator output to cause advancement in time by a predetermined amount (dt) of any such pel boundary transition relative to remaining pel boundary transitions.
摘要翻译： 为了通过有限的视频放大器的上升和下降时间来补偿引入到数字控制的光栅扫描CRT中的图像失真，数字视频驱动波形被进行选择性脉冲拉伸以延长每个像素的持续时间。 像素具有较低的光强度值（亮度）。 这通过比较器（14）来实现，比较器（14）检查视频数据流中与其紧邻的前一邻近PEL（N-1）相关的每个当前像素PEL（N），以便检测它们之间的像素边界跃迁，表示其增加 亮度从前一个像素到当前像素。 重新定时装置（17,19,21,22）可操作地在比较器输出的控制下，使得相对于剩余的像素边界转变在时间上提前任何这样的像素边界转变的预定量（dt）。
-
公开(公告)号：US4474065A
公开(公告)日：1984-10-02
申请号：US351077
申请日：1982-02-22
申请人： Milan H. Miessler
发明人： Milan H. Miessler
CPC分类号： G01S7/5206 , B06B1/0622 , G01S15/8913 , G01S15/8918
摘要： An ultrasonic probe (1) for use with ultrasonic imaging apparatus for investigating the internal structure of a body contains a pair of pulse echo receivers (RA1, RB1; RA2, RB2; . . . ) for each pulse transmitter in a linear array of transmitters (T1, T2, . . . ). The two receivers (A,B) in each pair lie in a plane at right-angles to the pulse propagation axis of the associated transmitter and equidistant therefrom. The outputs from the two receivers in each pair are correlated by multiplying in multipliers (11.1, 11.2, 11.3) so that in use the time coincident components of the two waveforms in each receiver pair are emphasized, thus focussing the echo information in the longitudinal plane of symmetry (4) of the probe.
摘要翻译： 用于调查身体内部结构的超声波成像装置的超声波探头（1）包含一对脉冲回波接收器（RA1，RB1; RA2，RB2 ...），用于发射器线性阵列中的每个脉冲发射器 （T1，T2，...）。 每对中的两个接收器（A，B）位于与相关联的发射器的脉冲传播轴线成直角的平面中，并与其等距。 每对中的两个接收机的输出通过在乘法器（11.1,11.2,11.3）中乘以相关联，使得在使用中强调每个接收机对中的两个波形的时间重合分量，从而将回波信息聚焦在纵向平面 的对称（4）探针。
-
搜索结果
2 条记录 (耗时 0.013 秒)